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Old 3rd September 2012, 08:17 PM   #121
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Finally I've received my ES9023 PCBs this afternoon, little boards : 80 x 50 mm only.

Dear Emeritus would you please point me the correct way to solder the polarized Tantalums caps ?
(C19, C22, C26, C29 and C8 for SE and C19, C22, C26 and C8 for BAL)
I've scanned the PCB and highlight concerned Tantalum caps footprint.
Thanks for your "enlighted" advices
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Old 3rd September 2012, 08:27 PM   #122
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Finally I've inquired a bit and the result seems OK for C19-22-26-29, please confirm.
I need some help about C8.
Thanks
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Old 3rd September 2012, 09:36 PM   #123
pchw is offline pchw  United States
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That's correct. If you are in doubt, one small trick (that's what I did) - measure the pads to the ground, there should be continuity between ground and -ve pad.

C8 is after the inductor (L3), so it can be the same parts as in the BOM which is non-polarized. Regardless, the above trick will tell you the correct orientation quickly.
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Old 3rd September 2012, 09:45 PM   #124
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Quote:
Originally Posted by pchw View Post
C8 is after the inductor (L3), so it can be the same parts as in the BOM which is non-polarized.
Wrong, C8 was changed to a 4.7 F 10 or 16 V tantalum cap as the regs don't like too low ESR caps at their outputs. Phil, you are right about the polarity. They are correct in the picture in post #122 but C8 is orientated the opposite way so + to the upper side. Normally I would have orientated all the same way but we started with non polarized caps in which case it would not have mattered.
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Last edited by jean-paul; 3rd September 2012 at 09:52 PM.
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Old 3rd September 2012, 09:47 PM   #125
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Quote:
Originally Posted by jean-paul View Post
Wrong, C8 was changed to a 4.7 F 10 or 16 V tantalum cap as the regs don't like too low ESR caps at their outputs.
And the polarity for C8 is ?

Last edited by korben69; 3rd September 2012 at 09:54 PM.
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Old 3rd September 2012, 09:50 PM   #126
pchw is offline pchw  United States
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Quote:
Originally Posted by jean-paul View Post
Wrong, C8 was changed to a 4.7 F 10 or 16 V tantalum cap as the regs don't like too low ESR caps at their outputs.
Yeah, but C8 is not right after the reg. It is C19 - L3 - C8. Are you saying L3 is not enough to decouple C8 from the reg? Anyway, I have no problem with using the 1uF film cap as in the BOM.

Edit: so the revised circuit is C19 (4.7uF tanlaum) -> L3 -> C8 (4.7uF tanlalum), i.e. C8 is changed from the 1uF film to 4.7uF tantalum.
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Last edited by pchw; 3rd September 2012 at 09:54 PM.
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Old 3rd September 2012, 09:59 PM   #127
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Quote:
Originally Posted by jean-paul View Post
Phil, you are right about the polarity. They are correct in the picture in post #122 but C8 is orientated the opposite way so + to the upper side.
Great Jean-Paul, thanks.
BTW the attached pic should be correct.
GB members will receive C19-22-26-29-8 (SE) or C19-22-26-8 (BAL) Vishay/Sprague 4.7F/10v Tantalum caps, according to ordered versions.
Second pic shows Tantalum SMD cap, white line indicates "+" polarity side.
Regards

Phil
Attached Images
File Type: jpg DAC PCB HR 50.jpg (110.8 KB, 183 views)
File Type: jpg Tantalum Cap 4.7F 10V.JPG (12.5 KB, 178 views)

Last edited by korben69; 3rd September 2012 at 10:15 PM.
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Old 3rd September 2012, 10:27 PM   #128
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Quote:
Originally Posted by pchw View Post
Yeah, but C8 is not right after the reg. It is C19 - L3 - C8. Are you saying L3 is not enough to decouple C8 from the reg? Anyway, I have no problem with using the 1uF film cap as in the BOM.

Edit: so the revised circuit is C19 (4.7uF tanlaum) -> L3 -> C8 (4.7uF tanlalum), i.e. C8 is changed from the 1uF film to 4.7uF tantalum.
Thanks for telling me what is in our design It was repeated a few times that 4.7 F tantalum is better for C8. It is not a major difference but still. But as always YMMV, I invite you to try it out.

Quote:
Originally Posted by pchw View Post
Edit: so the revised circuit is C19 (4.7uF tantalum) -> L3 -> C8 (4.7uF tantalum), i.e. C8 is changed from the 1uF film to 4.7uF tantalum.
Apart from the original spelling errors this is correct.
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Last edited by jean-paul; 3rd September 2012 at 10:37 PM.
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Old 3rd September 2012, 10:35 PM   #129
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Quote:
Originally Posted by korben69 View Post
Great Jean-Paul, thanks.
BTW the attached pic should be correct.
GB members will receive C19-22-26-29-8 (SE) or C19-22-26-8 (BAL) Vishay/Sprague 4.7F/10v Tantalum caps, according to ordered versions.
Second pic shows Tantalum SMD cap, white line indicates "+" polarity side.
Regards

Phil


Second pic shows Tantalum SMD cap, white line indicates "+" polarity side.

Please let everyone read this.
Attached Images
File Type: jpg Tantalum Cap 4.7F 10V.JPG (12.5 KB, 141 views)
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Last edited by jean-paul; 3rd September 2012 at 10:38 PM.
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Old 3rd September 2012, 10:37 PM   #130
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